Abraham shall surely become a nation great and mighty, and therefore has the interest of humanity in this act of retribution on Sodom.

18 After all, Abraham is going to become a great and mighty nation and through him all the nations of the earth will be blessed. Holman Christian Standard Bible ...

Abraham's plea to God not to destroy Sodom showed a good understanding of the righteousness and mercy of God.

The verse in question asserts that Abraham will become a great nation and emphasizes his role as a righteous leader in the faith community (cf. Genesis 18:18).

David Guzik commentary on Genesis 18, where God reconfirms His promise of a son, and Abraham intercedes for the cities of Sodom and Gomorrah.

This verse is part of the dialogue between God and Abraham, where God reveals to Abraham his plan to destroy the wicked city of Sodom.

Chapter 18. We have an account in this chapter of another interview between God and Abraham, probably within a few days after the former, as the reward of ...

In this verse, God reaffirms His promise to Abraham, emphasizing the significant role that Abraham and his descendants will play in God's plan for the world ...

God reveals His plans to Abraham because He chose Abraham. Here the Hebrew word "yada" is translated as the word chosen.